Simon, as I wrote I am only worried about ex-jws who, acting privately, try to conduct small witch-hunts on their own. I believe people have been identified on this forum because they posted to many details.
You are correct to say this information would not identify anyone completely. Neither would their street name. however you must agree that for people in small countries it give information about a person that can kindle a suspicion and make deniability a harder.
As I have written repeatedly, my concern is if someone (say my in-laws) were trying to figure out if I was on this board, the flag would tell them which (tens?) of posters on this board were potentially relevant in their search.